| An effective absorbing boundary algorithm for acoustical wave propagator |
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| 作者姓名： | Lin Zhibin Lu Jing and Xu Boling |
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| 作者单位： | Key Laboratory of Modern Acoustics，Institute of Acoustics，Nanjing University，Nanjing 210093，China |
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| 基金项目： | 国家自然科学基金;高等学校博士学科点专项科研项目 |
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| 摘 要： | In this paper,Berenger's perfectly matched layer(PML)absorbing boundary condition for electromagnetic waves is introduced as the truncation area of the computational domain to absorb one-dimensional acoustic wave for the scheme of acoustical wave propagator(AWP).To guarantee the efficiency of the AWP algorithm,a regulated propagator matrix is derived in the PML medium.Numerical simulations of a Gaussian wave packet propagating in one-dimensional duct are carried out to illustrate the efficiency of the combination of PML and AWP.Compared with the traditional smoothing truncation windows technique of AWP,this scheme shows high computational accuracy in absorbing acoustic wave when the acoustical wave arrives at the computational edges.Optimal coefficients of the PML configurations are also discussed.
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An effective absorbing boundary algorithm for acoustical wave propagator |
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| Lin Zhibin,Lu Jing and Xu Boling.An effective absorbing boundary algorithm for acoustical wave propagator[J].Progress in Natural Science,2007,17(9):1012-1017. |
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| Authors: | Lin Zhibin Lu Jing and Xu Boling |
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| Institution: | Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China |
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| Abstract: | In this paper,Berenger's perfectly matched layer(PML)absorbing boundary condition for electromagnetic waves is introduced as the truncation area of the computational domain to absorb one-dimensional acoustic wave for the scheme of acoustical wave propagator(AWP).To guarantee the efficiency of the AWP algorithm,a regulated propagator matrix is derived in the PML medium.Numerical simulations of a Gaussian wave packet propagating in one-dimensional duct are carried out to illustrate the efficiency of the combination of PML and AWP.Compared with the traditional smoothing truncation windows technique of AWP,this scheme shows high computational accuracy in absorbing acoustic wave when the acoustical wave arrives at the computational edges.Optimal coefficients of the PML configurations are also discussed. |
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| Keywords: | acoustical wave propagator perfectly matched layer absorbing boundary conditions (ABC) |
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